(Sgt) Drum Major Grenville Hall [Queen's Own Highlanders] - 'Drummy' also instructed on A/T JNCOs Cadre as well as co-'terrorising' the Senior Term [along with (WOII) Pipe Major Alec Yule & Band Sgt Major Geoff Evison!].  Once heard remonstrating thus with one of his drummers:  "Don't look down lad.  You'll find nothing down there: this is Yorkshire mate!" on Uniacke Square at AAS Harrogate sometime during 1963 - 1964.